dunham in denver, colorado, with a preview of what to expect when mitt romney and president obama take the stage in the first presidential debate. wççÑçÑ >>> president barack obama and mitt romney have only talked face to face on a handful of occasions and tonight they'll get a chance to go head to head in the first of three presidential debates. abc 2's tori dunham is in denver with what we can expect to see tonight. >>reporter: this is the big moment we've all been waiting for, the first of three presidential debates will take place tonight. we'll talk a little bit about the format here. it's going to last 90 minutes. it'll be moderated by jim lehrer and we're told there's no audience participation. this debate will focus on domestic policies, things like healthcare, the economy and the role of the government. but while the two candidates were off the trail yesterday getting ready and prepping for the big debate, their wives are giving us a little bit of insight. >> i get so nervous at these debates, and, you know, i'm like one of those parents watching their kid on the balance